function aon(){
	document.getElementById("a-left").style.background = "url(img/menu/left.png) no-repeat";
	document.getElementById("a-mid").style.background = "url(img/menu/bg.png) repeat-x";
	document.getElementById("a-right").style.background = "url(img/menu/right.png) no-repeat right";
	}
	
	function aoff(){
	document.getElementById("a-left").style.background = "";
	document.getElementById("a-mid").style.background = "";
	document.getElementById("a-right").style.background = "";
	}
	
	function bon(){
	    document.getElementById("b-left").style.background = "url(img/menu/left.png) no-repeat";
	    document.getElementById("b-mid").style.background = "url(img/menu/bg.png) repeat-x";
	    document.getElementById("b-right").style.background = "url(img/menu/right.png) no-repeat right";
	}
	
	function boff(){
	document.getElementById("b-left").style.background = "";
	document.getElementById("b-mid").style.background = "";
	document.getElementById("b-right").style.background = "";
	}
	
	function con(){
	    document.getElementById("c-left").style.background = "url(img/menu/left.png) no-repeat";
	    document.getElementById("c-mid").style.background = "url(img/menu/bg.png) repeat-x";
	    document.getElementById("c-right").style.background = "url(img/menu/right.png) no-repeat right";
	}
	
	function coff(){
	document.getElementById("c-left").style.background = "";
	document.getElementById("c-mid").style.background = "";
	document.getElementById("c-right").style.background = "";
	}
	
	function don(){
	    document.getElementById("d-left").style.background = "url(img/menu/left.png) no-repeat";
	    document.getElementById("d-mid").style.background = "url(img/menu/bg.png) repeat-x";
	    document.getElementById("d-right").style.background = "url(img/menu/right.png) no-repeat right";
	}
	
	function doff(){
	document.getElementById("d-left").style.background = "";
	document.getElementById("d-mid").style.background = "";
	document.getElementById("d-right").style.background = "";
	}

	function eon() {
	    document.getElementById("e-left").style.background = "url(img/menu/left.png) no-repeat";
	    document.getElementById("e-mid").style.background = "url(img/menu/bg.png) repeat-x";
	    document.getElementById("e-right").style.background = "url(img/menu/right.png) no-repeat right";
	}

	function eoff() {
	    document.getElementById("e-left").style.background = "";
	    document.getElementById("e-mid").style.background = "";
	    document.getElementById("e-right").style.background = "";
	}